The JBoss Enterprise Application Server allows users to deploy and manage Java applications — and part of this management is making sure our Java apps run smoothly. For memory-intensive applications, this can mean enabling optimization features such as large pages, which locks pages in memory for faster retrieval — albeit at the expense of a non-application performance. In this lab, we enable large pages and ensure there are no memory issues in our application.
Learning Objectives
Successfully complete this lab by achieving the following learning objectives:
- Enable Huge Pages via the Kernel
To enable huge pages from the kernel, we can use the
sysctlcommand:sudo sysctl -w vm.nr_hugepages=1- Enable Large Pages via JBoss EAP
Move into the JBoss EAP home directory:
cd /opt/jboss-eap/
Open the standalone configuration:
sudo vim standalone/configuration/standalone.xmlAdd the following under
extensions:<system-properties> <property name="JAVA_OPTS" value="-XX:+UseLargePages"/> </system-properties>
- Restart the Service
Restart JBoss EAP:
sudo systemctl restart jboss-eap-rhel
Grep the server log for startup warnings:
cat standalone/log/server.log | grep WARNING
